Just to make sure that we are on the same page, can you please let us know what is the type of the project?
I see that this question is flagged as Jira Core, but I saw that you also have Jira Software and Service Desk on your instance, so we need to confirm what type of project you can't find labels to post here the correct steps.
Thank you for the screenshots. The options are different because you are using a classic and not a next-gen project.
Please, go to the Project settings > Issue layout and click on Edit layout to check if the field Label appears on the list. Make sure that the field is placed on the "Primary fields" section.
Also, if possible, send us a screenshot of a ticket where the field label does not appear.
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